"To preform specific useful computing tasks, like word processing and calculation" is the correct answer. This is the whole purpose of system software. The third answer is some other type of software(third party software?) and the fourth answer is most likely a compiler. Those are the easiest to take off. The second could also work.
The two answers I would go with are the first and the second.
Answer:
Remote access VPN
Explanation:
The solution that represents the majority of VPN's on the markets and is commonly referred to as a VPN appliance is the Remote access VPN
A remote access VPN is a type of VPN that works by creating a virtual channel (appliance ) between different devices for the purpose of exchanging data in an encrypted form. although this Tunnel passes through the public internet the Data exchanged are only accessible by the devices connected via the tunnel only .
The remote access VPN is mostly used to connect an employee to the company's network therefore it represent the majority of VPNs in the market.
Answer:
B.O(1)
Explanation:
When we are implementing ADT stack using linked chain we can pop an entry from the stack having O(1) time complexity because in linked chain we have the head or top pointer in linked chain only.Popping and pushing in stack happens on only one end that is top.So we have move to move top in linked chain to the next and delete prev node.
Answer:
User-level Security
Explanation:
User-level security allows the user to access resources on a network using a username and password. User-level security offers higher and greater security than share-level security, which does not require a password to access files.
User-level security allows the database user access and permission to resources.
